Radio transmission system



May -3, 1927, I 1,626,699 ','H. SICHIEFERSTEIN I 'rygvid TRANSMISSION SYSTEM Filed Oct. 31. 1921 Y BY ATTORNEY Patented May 3, 1927,

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HEINRICH SCHIEFERSTEIN, OF.CI-I ARLOTTENBURG, NEAR, BERLIN, GERMANY, AS- SIG-NOR TO WESTINGHOUSE ELECTRIC & *MANUFACTURING COMPANY, A COR- PORA'IION or PENNSYLVANIA.

RADIO TRANSMISSION SYSTEM.

Application filed October 31, 1921, Serial No. 511,774, and in Germany January 26, 1921.

My invention relates to radio transmission devices and particularly to combinations including a vacuum-tube generator and a radiation circuit connected by link circuit.

It is an object of my invention to -pro vide a system of connections whereby the closeness of coupling may be varied without corresponding change in the tuning, and the tuning may be varied without causing corresponding changes in the coupling.

Other objects of myinvention will be apparent from the following detailed description and the accompanying drawing, in which the single figure is a diagrammatic illustration of apparatus and circuits embodying my invention. I

In the figure, the vacuum tube 1 .is provided with the usual cathode 2, anode 3 and control electrode 4. The anode and cathode are connected by a plate-circuit including an inductor'5, at least a portion of which is in inductive relation to an inductor 6 con nected between the control electrode 4: and the cathode 2. The plate-circuit also includes a source of energy 7 v p The oscillation generator is united with a radiation circuit 11 by means of a link circuit 12. The link circuit includes an inductor 13 which is inductively related to at least a portion of the inductor 5. This relation is adjustable. The adjustment may include means for varying the inductance of the inductor 5, the inductance of the inductor 13, the mutual inductance between them or all three inductances.

The link circuit also includes an inductor 14 inductively related to the inductor 6., and an inductor 15 inductively related to an inductor 16 in the radiation circuit. A provision for adjustment of the inductors 15 and 16 is made, which may include means for adjusting either the inductance of one inductor, the inductance of the other inductor, the mutual inductance between them or all three.

In the operation of the device, the platecircuit 3, 5, 7 ,2 delivers energy to the gridcircuit by the inductive relation between inductors 5 and 6, and also by way of the link circuit. The link circuit receives en ergy from the plate-circuit by the inductive the inductor 5, or inthe inductor 16. It is therefore possible to change the coupling without changing'the tuning of either circuit. v I

By proper adjustments of the variableinductances, the ratio between the voltage across the inductor 13 and the voltage across the inductor 15 .may be changed without changing the coupling. It is therefore possible not only to control the tuning with-' out changing the coupling, but to control the distribution of energy between the gen erator and the radiating circuit without altering the tuning. By this means it is possible to so adjust the device that the maximum efliciency is obtained.

It will be observed that the link circuit contains no capacity except the distributed capacity of the several windings. This distributed capacity is so small that, for all practical purposes, the link circuit may be regarded as an aperiodic circuit.

Although I have illustrated and specifi- Cally described only a single form ofmy in the art that many variations thereof are possible. I, therefore, do not wish to be limited, except as required by the prior art or indicated in the following claim.

I claim: 1 I In a radio sending device, an oscillation generator, including a feed-back coupling, a radiating circuit, a link circuit, transformers coupling said link circuit to said oscil- :inventiomit will be obvious to those skilled lation generator andsaid radiating circuit respectively, one of said transformers including members which are also a part said feed-back coupling. v p

In testimony whereof I aflix my signature.

of" 10G HEINRICH SCHIEFERSTEIN, 

